GardenCalc.io is a free collection of calculators built for homeowners tackling outdoor projects. Whether you're planning a deck, seeding a lawn, mulching a bed, or setting up an irrigation schedule, our tools give you accurate estimates in seconds — no sign-up, no fees, no fluff.
Outdoor project planning involves a lot of simple maths that most people either guess at or have to hunt down across multiple websites. Getting those numbers wrong means wasted materials, extra trips to the store, or projects that don't come out right. We built GardenCalc.io to put reliable, clearly explained calculations in one place, free for anyone to use.
Every calculator shows a full breakdown of how the result was calculated — not just the final number. We believe you should understand what you're buying and why, not just take our word for it.
Our calculators use standard industry rates and formulas. Results are estimates — real-world factors like irregular shapes, material defects, and site conditions mean you should always buy a small buffer above the calculated amount. Each tool includes guidance on appropriate buffer quantities.
Have a suggestion for a new calculator, spotted an error, or just want to say hello? We'd love to hear from you via the contact page.